Pump



Sept 14, 1943. HHQRNSCHUCH 2,329,373

PUMP

Filed Aug. 20, 1942 2 Sheets-Sheet 2 v u N i; :a

Q Q t :z5 n 0o A m \o\ n 32 Q u :gie e n QN lh -o b 2f) g Q E v E gg 25E VB f k xq q n INVENTOR k Hann/sHP/zac'zzdb HIS ATTORNEY.

Patented Sept. 14, 1943 UNITED STATES PATENT oFFlcE PUMP HannsHornschuch, Easton, Pa., assigner to Ingersoll-Rand Company, New York,N. Y., a corporation of New Jersey Application August 20, 1942, SerialNo. 455,397

2 Claims.

This invention relates to pumps, and more particularly to centrifugalpumps of the multi-stage type.

It is an object of this invention to provide an economical form ofbalanced multi-stage pump.

Another object of the invention is to provide a pump in which thevolutes of the pump are so arranged that the pressures within thevolutes, developed by certain impellers, are partly counterbalanced bythe pressures on the outside developed by the other pump stages. Theresult of this arrangement is that the metal in the casings can berelatively thin, thereby effecting a very material saving in the cost ofthe pump.

Another object of the invention is to produce a relatively simple formof pump capable of being readily dismantled and accessible for repairs.

Other objects and advantages of the invention will be in part obviousand in part pointed out hereinafter.

In the drawings showing a preferred embodiment of the invention and inwhich similar reference characters refer to similar parts,

Figure 1 is a side elevation of a pump, .constructed in accordance withthe practice of the invention,

Figure 2 is an elevation looking at the inlet end of the pump of Figure1, and

Figure 3 is a longitudinal vertical section along f the line 3 3 ofFigure 2 looking in the direction of the arrows.

Referring to the drawings, the pump is provided with an outer casingformed in two parts I0 and II, generally cup shaped and joined togetherat peripheral flanges I2 and I3 formed integrally with the casing halvesI0 and II respectively.

Within the casing formed by the two halves I6 and Il is rotatablysupported, a shaft I4 upon which are keyed or otherwise suitably mountedthe impellers I5, I6, I1 and I8 which, in the order named, are thefirst, second, third and fourth stage pressure producing elements. Suchimpellers are formed with any suitable type of blading, as is well knownto those skilled in the art of centrifugal pumps. In this instance, theforces acting on the impellers balance because of the alternate'facingof the impellers with respect to each other.

The shaft I4 is provided at its ends with bearings I9 and 20 of anysuitable description. The

bearing I9 is formed integrally with a bracket 2l supported on a lateralextension 22 of a stung box 23. Likewise, the bearing 20 is providedwith a bracket 24 supported by a lateral extension of the stufiing box25.

At its outer extremity, the casing half I0 is provided with acylindrical aperture 26 to receive a corresponding cylindrically shapedportion 21 of the stuflng box 23, held in place therein by means ofbolts 28. The joint so formed is rendered lluid tight by a suitable'gasket 29 compressed by tightening the bolts 28.

The impellers I5, I6, I1 and I8 are mounted on shaft I4 in any suitablemanner, preferably being held in proper spaced relationship by spacersas, for instance, between impellers I5 and I8 there is provided aspacing sleeve 30 and between impellers I6 and I1 a similar sleeve 3|.

At the inlet side of the impeller I5 is provided a spacer 32 and a shaftsleeve 33 held in place by suitable nut 34, packing being providedbetweenthe'shaftsleeve 33 and the spacer 32 as shown at 35. Similarly,at the inlet side of the impeller I6 is provided a spacer 36 and a shaftsleeve 31 held in place by a nut 38, packing being provided as shown at39.

Packing 43 is provided for the shaft within a suitable recess 40 and iscompressed between the flanged bushing 4I and a gland 42. In thisinstance, the shaft packing 43 is of the metallic type.

'Ihelcasing half II is provided with a stufling box 25, in this instanceexactly like the stuing box 23 and the shaft I4 at the adjacent portionand may be packed in exactly the same fashion at the opposite end of thecasing. Accordingly, the casing half II is provided with an aperture 45,also preferably cylindrical as is the aperture 26. It will be noted thatthe aperture 45 ls of sufcient diameterto permit withdrawal of thelmpeller I6 therethrough. Likewise, the aperture 26 is of sufficientsize t6 permit the passage Ytherethrough of the linpeller I5.

communicates with an internal passageway 48 having a wall 49 formedintegrally with the casing half I0 and extending about the shaft I4. Inthe wall 49 is provided a stepped bore 50 to receive the complementarystepped periphery of an internal Wall or ring 5I formed integrally withthe stuffing box 23 and supported thereon by webs as shown at 52. Withinthe ring 5i is a bore 53 forming a running iit with the impeller I5 toprevent leakage of uid under pressure back into the inlet passage formedin the stufng box 23 by ring 5I.

An additional wall 56, preferably also formed integrally with the casinghalf i6 forms with the outer wall a chamber' 55, into which fluid isadapted to be discharged from the volute 56 associated with impeller I5.The chamber 55 extends into the casing half Il where it is formed by theouter wall of that casing and inner wall 55 formed integrally therewith.Chamber 55 communicates, with the inlet of the second stage impeller I6,which is also provided with a volute 5l leading toa chamber 58 withinthe wall 56.

Chamber 58 is bounded by diaphragm 59 cast integrally with wall 56 and asecond diaphragm 6U, also formed integrally with that wall. Chamber 58communicates with the inlet of impeller II which is provided with adischarge chamber 6I associated with the volute 62 for the impeller IIand also with the inlet of the impeller I8.

Chamber 6I is completely inclosed within the walls 56 and 54 so that thepressure within the chamber 6| is partly counter-balanced by theexternal pressure in chamber 55. Volute 63 of the last stage impellerI8'is likewise completely inclosed within the chamber 6| and is adaptedto discharge through an aperture 63 associated with the dischargeconnection 41 by means of a passageway 54 cast integrally with thecasing half I6.

It Will be noted that to provide access to the impeller I8 a removablediaphragm 65 is provided between the impellers il and i8, it being heldin place by suitable studs 66.

The pump is preferably mounted on a base plate 6l' there being suitablelaterally extending arms 68 provided on the casing half lll supu portedby pedestals 86. A dovvel 69 locates the casing laterally andlongitudinally with respect to the base plate 6i.

Expansion of the pump casing is permitted and the out-board end of thepump is steadied by an upright flexible plate member l0 attached to thebase plate 6l by means of a suitable foot piece 1I and also attached atits upper end to the sturiing box by a suitable stud 72.'

In the making of casing halves it and il the chambers 55, 5t and 6I arecored and the walls thereof are therefore supported by suitable webs 82for the sake of rigidity.

The hereinabove described arrangement is especially suitable for servicesuch as pumping I hot oil, or where the pump has-t0 be occasionallydismantled either for cleaning or replacement of parts. It will be notedthat the pump can be completely dismantled without removing the casinghalf ID from the base and without disturbing the external connectionstothe inlet and discharge nozzles 46 and 4l.

Upon removal oi' the bearing 2B and the adjacent shaft packing, thestuffing box 44 can be removed to provide access to the impeller I6.This will permit removal of the lmpeller 6 and, if desired, the entirecasing half il may be re'- moved by unbolting at the flanges I2 and i3.

Access to the impeller I8 is provided by removing the studs G6 whichhold the diaphragm 65 in place, whereupon that mpeller may be withdrawnfrom the shaft. Likewise, the stuffing box 23 may be removed through theaperture 26 and, if desired, the impeller I5 may be pulled from theshaft through the aperture 26 and the shaft removed in the oppositedirection,

A still further advantage of this construction is the lightness of thecasing. It will be noted that the chamber 55, which acts as a transferpassage from the rst 'stage impeller I5 to the second stage impeller I6almost completely incloses the passageways associated with the otherstages. II may, therefore, be of relatively thin section. Furthermore,the shaft packings are not subjected to extremely high pressures and arerelatively easily maintained tight.

The inner walls, as for instance 56' and 54, may also be constructed ofrelatively light sections, since the outer pressure in the chamber 55counter-acts the inside pressure to a considerable degree. Furthermore,the chambers 58 and 6I are relatively smaller, which also tends topermit lighter wall sections. The same principle is carried stillfurther by the inclosure of the volute or diffusor 62 within the chamber6I. Thus the highest pressure, which is within the volute 62, isminimized in its effect on the Walls of the volute by the relativelycounter-balancing high pressure in the chamber 6|. There is provided asuccession of higher pressures from the outside to the interior, thehighest pressure being contained in a chamber surrounded by pressure uidfrom the next highest stage.

I claim:

1. In a pump, a series of impellers arranged in pairs symmetrically withrespect to a central plane, a shaft for supporting said impellers, acasing housing said impellers and vertically split adjacent said plane,and shaft stuffing boxes removable from the ends of said casing topermit removal of the outer impellers from the casing, said casing beingprovided with a passageway to conduct fluid between the outer twoimpellers and enveloping the inner impellers, said stufling boxes beingprovided with passageways forming inlets to said outer impellers.

2. In a pump, a series of impellers arranged in pairs symmetrically withrespect to a central plane, a shaft for supporting said impellers, acasing housing said impellers and vertically split adjacent said plane,shaft stufng boxes removable from the ends of said casing to permitremoval of the outer impellers from the casing, said casing beingprovided with a passageway to conduct fluid between the outer twoimpellers and enveloping the inner impellers, said stufling boxes beingprovided with passageways forming inlets to said outer impellers, and acentral diaphragm in a face of one half of said casing removable topermit withdrawal of one of said inner impellers therefrom.

HANNS HORNSCHUCH.

The outer walls of the casings I 0 and.

